. >> sine squared. >> if only 1/3 of high school seniors are academically prepared to go to college, the gates believe that a revolution in teaching can go a long way to pushing that up to their goal of 80%. they're funding research to figure out what makes great teachers great. >> do you feel like you're prepared, that you could go on and succeed in college? >> all: yes. >> the foundation is at work in schools in nearly all 50 states. >> what book are you reading? >> sort of like national parents, bill and melinda gates have helped pay college tuition for 20,000 american kids. >> the country is built on ingenuity. it's built on having lots of very well-educated people, and if you were from a poor family, how are you going to break out of that? well, education is the only way. education is the thing that 20 years from now will determine if this country is as strong and as just as it wants to be. >> one of the boldest efforts of the foundation is unfolding in the slums that we visited in delhi: an attempt to eradicate polio. no one in america has seen this since the 1960s. we found, i